[M4IF Technotes] transparent_mb()

[Jim Bowen]

Hi all,
In the visual standard, what does it mean when it says a transparent_mb()??
Is this a macroblock with the coded block pattern for both luminance and 
chrominance all zeros?? or is it refering to a macroblock that is not part 
of a shape that cannot be seen (and then how would a simple profile decoder 
deal with it)??
Thanks,
Jim
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